I've got a WR250R and absolutely LOVE it. It'll commute or ride the highway at 70mph all day long, then slow down for some good 1st-3rd gear trail work, then ride home. With luggage. It will literally go anywhere you're willing to point it assuming you have good tires on it.
30 miles one way isn't too big a deal for any dual sport, though most if not all of the plated MX/Enduro bikes will have some range issues with their stock gas tanks. They will be uncomfortable on pavement, be miserable on the highway at speed if they can even reach highway speeds thanks to gearing. Many of them only have 4spd or 5spd boxes with very narrow gearing. Great for putting power down in the woods or on the track, not so much for cruising around. Not the best choice for a commuter either, they're typically quite maintenance intensive. Personally, I don't consider plated dirt bikes to be 'dual sports' due to their lack of true road capabilities.
True dual sports, born and designed to be plated and compromised as such, can be pretty easily broken down.
Smaller, older tech, dual sports like the KLR250, Super Sherpa, CRF230L, XT225 and 250, TW200, DR350, and the like are usually cheap, light weight, and stone simple reliable but underwhelming performance wise. Good for bopping down easy trails and racking up lots of miles on back roads, but won't enjoy hard riding off-road. Figure a practical top speed of about 50-60mph. Great if you want a vintage trail bike without the vintage headaches lol.
Next level are the 50/50 or hardcore dual sport bikes. They're ok to good on road, but competent or even good off-road at the same time. KTM 450-530 EXC's are probably the gold standard, as they can race in the wood no problem, then ride home if you butt and hands can take the seat and vibes. Or cross country if you keep up on them. Down a little in performance, heavier, and less maintenance are the DRZ400S and WR250R. The KTM 690 enduro is a roided up orange version of this type too. Anywhere machines. Want to do some single track? Sweet! Want to tide to the tip of Argentina? Sweet! Want to do it on the same ride? ...sweet!
Heavyweight dual sports include the XR650L and DR650SE. Bigger bikes, bigger motors, more in common with the small displacement old tech dual sports but with higher performing motors and usually better suspension. Still very dirt capable and can be made to be good in the woods despite their weight. Stone simple and reliable too. Definite go-anywhere do just about anything machines, lower performance than the hardcore bikes but smoother on the highway.
Then there are the road bikes with long travel suspensions that are good for fire roads and light trail work. KLR650's are here because of their weight imo. All of the BMW's from the 650's on up to the R1200GS ADV. The big KTM's, Suzuki V-strom 650 and 1000. Ducati Multistrada. Triumph Tiger's. Big, comfortable bikes that can get loaded up with weight and travel to the ends of the earth without a second thought. Much faster on road, especially the multi cylinder bikes, but much to heavy for serious trail work.
So which is right for you? Depends on what kind of riding you're going to do. Trailering to the local trail head, needing a plate to connect to the next trail while riding, etc, get a plated dirt bike. Wanting to commute frequently as well as riding trails on weekends, to and from as well, either the small old tech bikes (cheap) or a 50/50 machine depending on how much you want to spend and how much performance you need. Want to ride fire roads and traveling, get a heavy weight with an eye towards how much dirt you really plan on doing and adjust accordingly.
